Centrifugal machine rotor positioning device

Abstract

The utility model discloses a centrifuge rotor positioning device which comprises a motor body and a positioning assembly arranged at the rotating end of the motor body, the positioning assembly comprises an identification part and a brake assembly, the rotating end of the motor body is provided with a first induction block corresponding to the identification part, and the first induction block and the motor body rotate synchronously. The brake assembly is arranged on the periphery of the rotating end of the motor body, and when the recognition part recognizes different circumferential given positions of the first induction block, the brake assembly sequentially prevents the rotating end of the motor body from rotating until positioning of all the circumferential given positions is completed; according to the utility model, the radial angle of the motor is monitored in real time through the identification part, and a braking electric signal is sent to the braking assembly to stop the rotation of the motor, so that the motor is not contacted during centrifugation, and the braking assembly and the motor actively and temporarily contact during braking to realize accurate positioning of the rotating end of the motor; the whole positioning process is automatically completed by the positioning assembly, and the automation degree and the working efficiency are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of centrifuges, in particular to a centrifuge rotor positioning device. Background Art

[0002] With the development of the centrifuge industry, new demands are constantly being discovered, and automated operation of centrifuges is one of them. Since automated operation requires precise positioning, the conventional motor drive method currently used in the centrifuge industry cannot meet the demand. Therefore, a centrifuge that can meet the precise positioning of the centrifuge rotor is needed. Although the centrifuge driven by servo motors solves the positioning problem, the speed is low and cannot meet the high speed requirements of the centrifuge. In addition, the driving structure is complex and the cost is high, making it difficult to promote. Utility Model Content

[0003] In order to solve the problem of accurate positioning of centrifuge automation, the utility model provides a centrifuge rotor positioning device, which monitors the radial angle of the motor in real time through an identification part and sends a brake electrical signal to a brake component to stop the rotation of the motor, so that the motor is contactless during centrifugation and only actively and briefly contacts the motor during braking to accurately position the rotating end of the motor and stop it.

[0004] In order to achieve the above technical objectives, the utility model is implemented through the following technical solutions:

[0005] A centrifuge rotor positioning device comprises a motor body and a positioning assembly arranged at a rotating end of the motor body;

[0006] Wherein, the positioning component includes an identification part and a braking component, the rotating end of the motor body is provided with a first sensing block corresponding to the identification part, and the first sensing block rotates synchronously with the motor body, and the braking component is arranged around the rotating end of the motor body. When the identification part identifies different circumferential given positions of the first sensing block, the braking component sequentially prevents the rotation of the rotating end of the motor body until the positioning of all the circumferential given positions is completed.

[0007] In this solution, when the rotating end of the motor body rotates at a high speed, the rotating end drives the first sensing block at the tail of the motor body to rotate synchronously. During this process, the recognition unit monitors the radial rotation angle of the first sensing block in real time. After the recognition unit gives a position signal, the brake assembly actively and briefly contacts the rotating end of the motor body. After the centrifugation is completed, the motor body continues to rotate at an extremely low speed, and the recognition unit continues to capture the radial rotation angle of the rotating end of the motor body. When the first sensing block rotates to its set angle in the motor body, the recognition unit gives a brake signal, and the brake assembly locks the rotating end of the motor body to complete the precise positioning and stopping of the motor. The entire positioning process is automatically completed by the positioning assembly, avoiding manual contact with the sample and improving the degree of automation and work efficiency.

[0008] As a further technical solution to the centrifuge rotor positioning device, the brake assembly includes a magnetic component and a brake component, the brake component is fixedly arranged at the rotating end of the motor body, and the magnetic component is mounted above the braking surface of the brake component through an elastic component. When the identification part identifies different circumferential given positions of the first sensing block, the magnetic component adsorbs the braking surface to prevent the rotation of the rotating end of the motor body.

[0009] In this solution, the magnetic component is mounted above the braking surface of the brake component through an elastic component. The elastic component provides elastic restoring force for the magnetic component. When the magnetic component receives the braking signal given by the identification unit, the magnetic component will actively absorb the braking surface of the brake component. At this time, the elastic component elastically deforms to give the magnetic component an active distance to attract the brake component. When the positioning is completed, the elastic restoring force of the elastic component will reset the magnetic component to prepare for the next positioning.

[0010] As a further technical solution of the centrifuge rotor positioning device, the motor body includes a fixing seat, the fixing seat rotates synchronously with the motor body, the first sensing block is embedded in the end surface of the fixing seat, and the identification part is arranged on the rotation path of the fixing seat.

[0011] As a further technical solution of the centrifuge rotor positioning device, the magnetic attraction part includes an electromagnetic clutch coil, which is electrically connected to the identification part. When the electromagnetic clutch coil receives a brake signal given by the identification part, the electromagnetic clutch coil is energized to actively absorb the braking surface of the brake part, thereby shortening the braking time, achieving precise positioning and stopping of the centrifuge, and improving the automation degree and work efficiency of the centrifuge.

[0012] As a further technical solution to the centrifuge rotor positioning device, the motor body also includes a motor shaft, and the brake component includes an electromagnetic clutch movable plate, wherein the electromagnetic clutch movable plate is penetrated through the motor shaft and locked to the motor shaft through a locking hole. When the magnetic suction component receives a brake signal given by the identification unit, the magnetic suction component will actively absorb the electromagnetic clutch movable plate. Since the electromagnetic clutch movable plate is fixedly connected to the motor shaft, it can synchronously prevent the rotation of the motor shaft, thereby achieving the purpose of precise positioning and stopping.

[0013] As a further technical solution of the centrifuge rotor positioning device, the other end of the fixing seat is fixed to the tail end of the motor shaft through radial constraint and axial constraint to prevent the fixing seat from falling off during high-speed rotation.

[0014] As a further technical solution of the centrifuge rotor positioning device, the positioning assembly also includes a mounting plate, the elastic member is provided with a first mounting hole near the outer edge, the middle portion of the elastic member is provided with a second mounting hole, the mounting plate is connected to the tail portion of the motor body, and the identification portion and the brake assembly are arranged in an internal cavity of the mounting plate, the elastic member is fixed to the bottom wall of the cavity of the mounting plate through the first mounting hole, and the elastic member fixes the magnetic attraction member through the second mounting hole.

[0015] In this solution, the elastic part serves as an intermediate connecting part, which is fixedly connected to the bottom wall of the cavity of the mounting plate near the outer edge, and is connected to the magnetic part in the middle so that the magnetic part is always in a suspended state. In this way, the brake part can be adsorbed in time when the magnetic part is energized, thereby reducing the positioning error.

[0016] As a further technical solution of the centrifuge rotor positioning device, the cross-sectional shape of the elastic member is a polygon.

[0017] As a further technical solution of the centrifuge rotor positioning device, the identification part includes an integrated circuit board, the outer end of the mounting plate is provided with a groove for accommodating the identification part, and a second sensing block is provided in the middle of the integrated circuit board, and the second sensing block is directly opposite to the first sensing block.

[0018] As a further technical solution of the centrifuge rotor positioning device, the positioning assembly also includes a protective cover, and the protective cover is connected around the groove.

[0019] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0020] The utility model provides a centrifuge rotor positioning device, comprising a motor body and a positioning component arranged at the rotating end of the motor body, wherein the positioning component comprises an identification part and a brake component, the rotating end of the motor body is provided with a first induction block corresponding to the identification part, when the rotating end of the motor body rotates at a high speed, the rotating end drives the first induction block at the tail of the motor body to rotate synchronously, the radial angle of the motor is monitored in real time by the identification part and a brake electric signal is sent to the brake component to prevent the rotation of the motor, after the centrifugation is completed, the motor body continues to rotate at a very small speed, the identification part continues to capture the radial rotation angle of the rotating end of the motor body, when the first induction block rotates to its set angle in the motor body, the identification part gives a brake signal, the brake component locks the rotating end of the motor body, and the motor is accurately positioned and stopped, the whole positioning process is automatically completed by the positioning component, the accurate positioning and stopping of the centrifuge is realized, and the automation degree and working efficiency of the centrifuge are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings described herein are used to provide a further understanding of the embodiments of the present utility model, constitute a part of this application, and do not constitute a limitation of the embodiments of the present utility model. In the drawings:

[0022] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0023] Figure 2 It is a schematic diagram of the top view structure of the utility model;

[0024] Figure 3 for Figure 2 A schematic diagram of a cross-sectional structure marked AA in the figure;

[0025] Figure 4 for Figure 3 A schematic diagram of the enlarged structure marked A in the figure;

[0026] Figure 5 for Figure 3 Schematic diagram of the enlarged structure marked with B;

[0027] Figure 6 for Figure 3 Schematic diagram of the enlarged structure marked with C;

[0028] Figure 7 It is a structural schematic diagram of the electromagnetic clutch moving plate;

[0029] Figure 8 This is a schematic diagram of the structure of the utility model when the installation disk is not installed;

[0030] Fig. 9 This is a schematic diagram of the structure of the utility model when the mounting plate and the motor are not installed;

[0031] Fig.10It is a schematic diagram of the structure of the spring sheet.

[0032] Marks and corresponding parts names in the attached drawings:

[0033] 1-motor body, 2-mounting plate, 3-motor shaft, 4-electromagnetic clutch moving plate, 5-electromagnetic clutch coil, 6-fixed seat, 7-first induction block, 8-integrated circuit board, 9-protective cover, 10-balance slot, 11-balance hole, 12-locking hole, 13-elastic member, 14-second induction block, 15-braking surface, 16-first mounting hole, 17-second mounting hole. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the utility model more clearly understood, the utility model is further described in detail below in conjunction with embodiments and drawings. The schematic implementation manner of the utility model and its description are only used to explain the utility model and are not intended to limit the utility model.

[0035] Example 1

[0036] This embodiment 1 provides a centrifuge rotor positioning device, such as Figure 1-Figure 3 As shown, the motor body 1 includes a motor shaft 3 located on the rotor and a positioning component arranged at the rear end of the motor shaft 3 .

[0037] Among them, see Figure 3-Figure 5 As shown, the positioning assembly includes an identification part and a braking assembly. The motor shaft 3 is provided with a first sensing block 7 corresponding to the identification part, and the first sensing block 7 rotates synchronously with the motor shaft 3. The braking assembly is arranged around the motor shaft 3. When the identification part identifies different circumferential given positions of the first sensing block 7, the braking assembly sequentially blocks the rotation of the motor shaft 3 until the positioning of all circumferential given positions is completed.

[0038] For details, please refer to Figure 3-Figure 5 As shown, the above-mentioned brake assembly includes a magnetic part and a brake part. The brake part is fixedly arranged on the shaft body of the motor shaft 3. The magnetic part is mounted above the braking surface of the brake part through an elastic part 13. The elastic part provides elastic restoring force for the magnetic part. When the identification part identifies different circumferential given positions of the first sensing block 7, the identification sends a braking signal to the magnetic part. When the magnetic part receives the braking signal given by the identification part, it will actively absorb the braking surface 15 of the brake part. At this time, the elastic part 13 gives the active distance of the magnetic part to attract the brake part through elastic deformation. When the positioning is completed, the elastic restoring force of the elastic part 13 will reset the magnetic part.

[0039] In this embodiment, the magnetic attraction part is an electromagnetic clutch coil 5, the braking part is an electromagnetic clutch movable plate 4, and the elastic part 13 is a spring sheet. The above components constitute an electromagnetic clutch structure. Since the electromagnetic clutch coil 5 is electrically connected to the identification part, when the electromagnetic clutch coil 5 receives the braking signal given by the identification part, the electromagnetic clutch coil 5 will actively absorb the braking surface 15 of the electromagnetic clutch movable plate 4 when it is energized, thereby shortening the braking timeliness. When the electromagnetic clutch coil 5 is de-energized, the installed spring sheet will rebound to reset the electromagnetic clutch coil 5.

[0040] For more precise positioning of the electromagnetic clutch structure, please refer to Figure 3-Figure 10 As shown, the electromagnetic clutch movable plate 4 is penetrated on the motor shaft 3, and a plurality of locking holes 12 are arranged on the circumferential outer side wall of the electromagnetic clutch movable plate 4. The locking holes 12 between the electromagnetic clutch movable plate 4 and the motor shaft 3 are limited in axial and radial relative movement by installing top screws. In order to make the connection more stable, the electromagnetic clutch movable plate 4 and the motor shaft 3 can also be made to have an interference fit. Since the electromagnetic clutch movable plate 4 rotates synchronously with the motor shaft 3, certain vibrations will inevitably occur during the rotation process. In order to reduce the noise and jitter of the electromagnetic clutch movable plate 4 during rotation, the surface of the electromagnetic clutch movable plate 4 is also provided with a balancing groove 10 and a balancing hole 11.

[0041] At the same time, a fixing seat 6 is also provided at the tail end of the motor shaft 3. One end of the fixing seat 6 is fixed to the tail end of the motor shaft 3 by interference fit and a top screw, so that the fixing seat 6 and the motor body rotate synchronously. The other end of the fixing seat 6 is embedded with the above-mentioned first sensing block 7. The first sensing block 7 is fixed to the end of the fixing seat 6 by anaerobic glue and interference fit, and the corresponding identification part is arranged on the rotation path of the fixing seat 6.

[0042] To improve the positioning accuracy of the positioning components, please refer to Figure 3-Figure 10 As shown, the positioning assembly also includes a mounting disk 2, the cross-sectional shape of the elastic member 13 is a triangle or other polygonal structure, a first mounting hole 16 is provided near the outer edge of the polygonal vertex of the elastic member 13, a second mounting hole 17 is provided in the middle of the elastic member 13, the mounting disk 2 is connected to the tail of the motor body, and the identification part and the brake assembly are both provided in the internal cavity of the mounting disk 2, the elastic member 13 is fixed to the bottom wall of the cavity of the mounting disk 2 through the first mounting hole 16, the elastic member 13 passes through the motor shaft 3 and fixes the magnetic attraction member through the second mounting hole 17, so that the magnetic attraction member is always in a suspended state, so that the brake member can be adsorbed in time when the magnetic attraction member is energized to reduce the positioning error.

[0043] At the same time, if Figure 5As shown, a groove for accommodating an identification part is provided at the outer end of the mounting plate 2. The identification part includes an integrated circuit board 8. The integrated circuit board 8 is a magnetic encoder. A second sensing block 14 is provided in the middle of the magnetic encoder. The second sensing block 14 is opposite to the first sensing block 7 and is used for real-time monitoring of the radial rotation angle of the first sensing block 7.

[0044] In this embodiment, the positioning assembly further includes a protective cover 9 , which is connected around the groove and is used to protect the integrated circuit board 8 .

[0045] The specific use steps of the centrifuge rotor positioning device provided in this embodiment 1 are as follows:

[0046] S1. When the motor body 1 rotates at high speed, the second sensing block 14 monitors the radial angle of the motor body 1 in real time. When the second sensing block 14 recognizes the initial position of the first sensing block 7, the recognition unit sends a braking electrical signal to the electromagnetic clutch coil 5. The electromagnetic clutch coil 5 is energized and deforms through the elastic member 13 to give the electromagnetic clutch coil 5 an active distance for attracting the electromagnetic clutch movable plate 4, thereby completing the first positioning. In this embodiment, the recognition unit can set any preset position of the first sensing block 7 as the positioning origin. When centrifuging, the motor spindle 3 drives the first sensing block 7 to rotate, and the recognition unit detects the rotation amount of the motor spindle 3, and then determines the real-time position of the motor spindle 3 during the rotation process based on the positioning origin, thereby achieving precise positioning of the motor body 1.

[0047] S2. After the first positioning is completed, the motor body 1 continues to rotate at an extremely low speed. When the recognition unit recognizes the circumferential given position of the first induction block 7, the recognition unit sends a braking electrical signal to the electromagnetic clutch coil 5 again, and the electromagnetic clutch coil 5 is energized and the electromagnetic clutch movable plate 4 is attracted to prevent the rotation of the motor shaft 3, completing the second positioning. At this time, the device stays at the preset position for subsequent cooperation with the device to take and place the sample;

[0048] S3. Repeat step S3 until all positions are positioned and all samples are placed and taken.

[0049] The above process monitors the radial angle of the motor in real time through the identification unit and sends a brake electrical signal to the brake assembly to stop the rotation of the motor, so that the motor is contactless when centrifugal and only actively and briefly contacts the motor when braking to achieve precise positioning of the rotating end of the motor. The entire positioning process is automatically completed by the positioning assembly, which improves the degree of automation and work efficiency.

[0050] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only the specific implementation method of the utility model and is not used to limit the protection scope of the utility model. Any modifications, equivalent replacements (such as the electromagnetic clutch structure can also be replaced by a friction clutch or a hydraulic coupling), improvements, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A centrifuge rotor positioning device, characterized in that: It comprises a motor body (1) and a positioning component arranged at the rotating end of the motor body (1); The positioning assembly comprises an identification part and a braking assembly, the rotating end of the motor body (1) is provided with a first sensing block (7) corresponding to the identification part, and the first sensing block (7) rotates synchronously with the motor body (1), and the braking assembly is arranged around the rotating end of the motor body (1). When the identification part identifies different circumferential given positions of the first sensing block (7), the braking assembly sequentially prevents the rotation of the rotating end of the motor body (1) until the positioning of all the circumferential given positions is completed.

2. A centrifuge rotor positioning device according to claim 1, characterized in that: The brake assembly comprises a magnetic member and a brake member, wherein the brake member is fixedly arranged at the rotating end of the motor body (1), and the magnetic member is mounted above the brake surface (15) of the brake member through an elastic member (13). When the identification unit identifies different circumferential given positions of the first sensing block (7), the magnetic member adsorbs the brake surface (15) to prevent the rotating end of the motor body (1) from rotating.

3. A centrifuge rotor positioning device according to claim 2, characterized in that: The motor body (1) comprises a fixing seat (6), the fixing seat (6) rotates synchronously with the motor body (1), the first sensing block (7) is embedded in the end surface of the fixing seat (6), and the identification part is arranged on the rotation path of the fixing seat (6).

4. A centrifuge rotor positioning device according to claim 2, characterized in that: The magnetic attraction component comprises an electromagnetic clutch coil (5), and the electromagnetic clutch coil (5) is electrically connected to the identification part.

5. A centrifuge rotor positioning device according to claim 3, characterized in that: The motor body (1) also includes a motor shaft (3), and the brake component includes an electromagnetic clutch movable plate (4), wherein the electromagnetic clutch movable plate (4) is penetrated on the motor shaft (3) and locked to the motor shaft (3) through a locking hole (12).

6. A centrifuge rotor positioning device according to claim 5, characterized in that: The other end of the fixing seat (6) is fixed to the tail end of the motor shaft (3) through radial constraint and axial constraint.

7. A centrifuge rotor positioning device according to claim 5, characterized in that: The positioning assembly also includes a mounting plate (2), the elastic member (13) is provided with a first mounting hole (16) near the outer edge, the middle portion of the elastic member (13) is provided with a second mounting hole (17), the mounting plate (2) is connected to the rear portion of the motor body (1), and the identification portion and the brake assembly are arranged in an internal cavity of the mounting plate (2), the elastic member (13) is fixed to the bottom wall of the cavity of the mounting plate (2) through the first mounting hole (16), and the elastic member (13) is fixed to the magnetic attraction member through the second mounting hole (17).

8. A centrifuge rotor positioning device according to claim 7, characterized in that: The cross-sectional shape of the elastic member (13) is a polygon.

9. A centrifuge rotor positioning device according to claim 7, characterized in that: The identification part comprises an integrated circuit board (8), the outer end of the mounting plate (2) is provided with a groove for accommodating the identification part, the middle part of the integrated circuit board (8) is provided with a second sensing block (14), and the second sensing block (14) is directly opposite to the first sensing block (7).

10. A centrifuge rotor positioning device according to claim 9, characterized in that: The positioning assembly also includes a protective cover (9), and the protective cover (9) is connected around the groove.

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